Two more Banksy murals are headed to auction and their combined sales are estimated to reach over $1 million, Reuters reports.

One mural featuring a boy with a paintbrush standing next to the words, “I remember when all this was trees,” was painted during Banksy’s time in Detroit. The other, entitled Donkey Documents, comes from the street artist’s visit to Isreal in 2007.

Researchers have used compounds found in algae and reef fish mucus to create a material that naturally blocks harmful UV rays, according to a paperpublished recently in ACS Applied Materials & Interfaces.